folly::compression::instructions::Default Struct Reference

#include <Instructions.h>

Inheritance diagram for folly::compression::instructions::Default:

Static Public Member Functions
static bool	supported (const folly::CpuId &={})
static FOLLY_ALWAYS_INLINE uint64_t	popcount (uint64_t value)
static FOLLY_ALWAYS_INLINE int	ctz (uint64_t value)
static FOLLY_ALWAYS_INLINE int	clz (uint64_t value)
static FOLLY_ALWAYS_INLINE uint64_t	blsr (uint64_t value)
static FOLLY_ALWAYS_INLINE uint64_t	bextr (uint64_t value, uint32_t start, uint32_t length)
static FOLLY_ALWAYS_INLINE uint64_t	bzhi (uint64_t value, uint32_t index)

Detailed Description

Definition at line 42 of file Instructions.h.

Member Function Documentation

static FOLLY_ALWAYS_INLINE uint64_t folly::compression::instructions::Default::bextr ( uint64_t  value, uint32_t  start, uint32_t  length  )

inlinestatic

Definition at line 65 of file Instructions.h.

References start.

Referenced by TEST().

                                                         {
    if (start > 63) {
      return 0ULL;
    }
    if (start + length > 64) {
      length = 64 - start;
    }

    return (value >> start) &
        ((length == 64) ? (~0ULL) : ((1ULL << length) - 1ULL));
  }

static FOLLY_ALWAYS_INLINE uint64_t folly::compression::instructions::Default::blsr ( uint64_t  value )

inlinestatic

Definition at line 57 of file Instructions.h.

References FOLLY_ALWAYS_INLINE, and uint64_t.

                                                           {
    return value & (value - 1);
  }

static FOLLY_ALWAYS_INLINE uint64_t folly::compression::instructions::Default::bzhi ( uint64_t  value, uint32_t  index  )

inlinestatic

Definition at line 78 of file Instructions.h.

References uint64_t.

                                                                           {
    if (index > 63) {
      return 0;
    }
    return value & ((uint64_t(1) << index) - 1);
  }

static FOLLY_ALWAYS_INLINE int folly::compression::instructions::Default::clz ( uint64_t  value )

inlinestatic

Definition at line 53 of file Instructions.h.

                                                     {
    DCHECK_GT(value, 0u);
    return __builtin_clzll(value);
  }

static FOLLY_ALWAYS_INLINE int folly::compression::instructions::Default::ctz ( uint64_t  value )

inlinestatic

Definition at line 49 of file Instructions.h.

                                                     {
    DCHECK_GT(value, 0u);
    return __builtin_ctzll(value);
  }

static FOLLY_ALWAYS_INLINE uint64_t folly::compression::instructions::Default::popcount ( uint64_t  value )

inlinestatic

Definition at line 46 of file Instructions.h.

References uint64_t.

                                                               {
    return uint64_t(__builtin_popcountll(value));
  }

static bool folly::compression::instructions::Default::supported ( const folly::CpuId &  = {} )

inlinestatic

Definition at line 43 of file Instructions.h.

                                              {}) {
    return true;
  }

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The documentation for this struct was generated from the following file:

• proxygen/folly/folly/experimental/Instructions.h